Hor sync problem

[sean]

On a couple of sets I worked on the horizontal would go out of sync after working fine for awhile. In both instances it turned out being mica caps that became leaky. In one set it was the cap coupling the sync separator to the hor. phase detector. This put a high voltage on the phase detector (something like 110V when it should have been a couple of volts). In the other case it was a capacitor in the horizontal oscillator circuit. Start checking your voltages in the horizontal section.

[Giulio Maiocco]

Hi,

Sean, you were right, the problem turned out to be a 200pF mica capacitor in the hor oscillator circuit. Now the oscillograms are very stable

I wish you all a happy christmas and a happy new year

Thanks

Giulio Maiocco